US Bridges

On Ramp I 15N over SR 579 Bonanza Road

Good

Clark County, Nevada · Las Vegas · Structure no. H 942R

Built
2010
15 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
225 ft
2 main spans
Daily traffic
18,200
2021 count
Owner
State
State Highway Agency

About this bridge

On Ramp I 15N over SR 579 Bonanza Road is a prestressed concrete stringer/multi-beam or girder carrying On Ramp I 15N over SR 579 Bonanza Road in Clark County, Nevada. It was built in 2010, so it is 15 years old, younger than the Nevada average of 36.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 18,200 vehicles a day, roughly 5% of them trucks, projected to reach 28,747 by 2040. The structure is 225 ft (68.5 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOn Ramp I 15N
CrossesSR 579 Bonanza Road
LocationLas Vegas
RouteInterstate 15
CountyClark County
StateNevada
Coordinates36.17723, -115.15059
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.1 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length225 ft (68.5 m)
Longest span115 ft (35 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,200 (2021)
Projected traffic28,747 by 2040
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was On Ramp I 15N over SR 579 Bonanza Road built?

It was built in 2010, making it 15 years old in 2025.

What condition is On Ramp I 15N over SR 579 Bonanza Road in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does On Ramp I 15N over SR 579 Bonanza Road carry?

About 18,200 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is On Ramp I 15N over SR 579 Bonanza Road?

The structure is 225 ft (68.5 m) long with a longest span of 115 ft (35 m) and a deck 29 ft wide.

Who owns On Ramp I 15N over SR 579 Bonanza Road?

It is owned by the State Highway Agency.